80 lines
1.8 KiB
Go
80 lines
1.8 KiB
Go
package nasin
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import "image"
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import "errors"
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import "tomo"
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// Application represents a Tomo/Nasin application.
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type Application interface {
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Init () error
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}
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// Run initializes Tomo and Nasin, and runs the given application. This function
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// will block until the application exits or a fatal error occurrs.
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func Run (application Application) {
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loadPlugins()
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backend, err := instantiateBackend()
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if err != nil {
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println("nasin: cannot start application:", err.Error())
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return
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}
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backend.SetTheme(theme)
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tomo.SetBackend(backend)
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if application == nil { panic("nasin: nil application") }
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err = application.Init()
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if err != nil {
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println("nasin: backend exited with error:", err.Error())
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return
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}
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err = backend.Run()
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if err != nil {
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println("nasin: backend exited with error:", err.Error())
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return
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}
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return
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}
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// Stop stops the event loop
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func Stop () {
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assertBackend()
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tomo.GetBackend().Stop()
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}
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// Do executes the specified callback within the main thread as soon as
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// possible.
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func Do (callback func()) {
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assertBackend()
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tomo.GetBackend().Do(callback)
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}
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// NewWindow creates a new window within the specified bounding rectangle. The
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// position on screen may be overridden by the backend or operating system.
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func NewWindow (bounds image.Rectangle) (tomo.MainWindow, error) {
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assertBackend()
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return tomo.GetBackend().NewWindow(bounds)
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}
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func assertBackend () {
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if tomo.GetBackend() == nil {
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panic("nasin: no running tomo backend")
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}
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}
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func instantiateBackend () (backend tomo.Backend, err error) {
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// find a suitable backend
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for _, factory := range factories {
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backend, err = factory()
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if err == nil && backend != nil { return }
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}
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// if none were found, but there was no error produced, produce an error
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if err == nil {
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return nil, errors.New("no available tomo backends")
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}
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return
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}
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